Bottecchia D, Vermylen J. Factor VIII and human platelet aggregation. I. Evience that the platelet aggregating activity of bovine factor VIII is a property of its 'carrier protein' subunit.
Br J Haematol 1976;
34:303-11. [PMID:
987796 DOI:
10.1111/j.1365-2141.1976.tb00200.x]
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Abstract
Bovine factor VIII is a potent inducer of aggregation of human platelets. Upon gel filtration of five-thousand-fold purified material in 0.5 M CaCl2, bovine factor VIII is separated into high and low molecular weight components; the former contains both a 'carrier protein' and platelet aggregating activity, the latter the procoagulant activity (low molecular weight factor VII, LMW-FVIII). Upon removal of Ca2+ ions, LMW-F VIII recombines with the 'carrier protein'. LMW-F VIII modifies aggregation by 'carrier protein', but not aggregation by undissociated bovine factor VII, adenosine-5'-diphosphate or adrenaline. This finding indicates that the platelet aggregating activity in indeed a property of the 'carrier protein'.
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